From: http://ktechlab.org/download/gpsim.php
The latest stable version (0.21.11) of gpsim contains
two bugs which affect KTechlab:
High level language debugging does not work.
Crash on second loading of a PIC program.
patch also on website
Anonymous
Closed, resubmit if problem occurs in current SVN version
Closed, resubmit if problem occurs in current SVN version